From: Joshua D. Drake <jd@commandprompt.com>
To: Mario Splivalo <mario.splivalo@megafon.hr>
Cc: pgsql-performance@postgresql.org
Subject: Re: SELECT INTO large FKyed table is slow
Date: Tue, 30 Nov 2010 17:47:32 -0800
Message-ID: <1291168052.20631.1963.camel@jd-desktop> (raw)
In-Reply-To: <4CF24103.8030209@megafon.hr>
References: <4CF24103.8030209@megafon.hr>
On Sun, 2010-11-28 at 12:46 +0100, Mario Splivalo wrote:
> The database for monitoring certain drone statuses is quite simple:
>
> This is the slow part:
> INSERT INTO drones_history (sample_id, drone_id, drone_log_notice,
> drone_temperature, drone_pressure)
> SELECT * FROM tmpUpdate;
>
> For 100 rows this takes around 2 seconds. For 1000 rows this takes
> around 40 seconds. For 5000 rows this takes around 5 minutes.
> For 50k rows this takes around 30 minutes! Now this is where I start lag
> because I get new CSV every 10 minutes or so.
Have you considered making the foreign key check deferrable?
JD
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To: pgsql-performance@postgresql.org
Cc: jd@commandprompt.com, mario.splivalo@megafon.hr
Subject: Re: SELECT INTO large FKyed table is slow
In-Reply-To: <1291168052.20631.1963.camel@jd-desktop>
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